<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFormRef" :model="LoginForm" :rules="LoginFormRules" label-width="0px" class="login_form">
        <!-- 用户名输入框区域 -->
        <el-form-item prop="username">
          <!--prefix-icon 这是element-ui带的属性用法    iconfont icon-user 这是阿里字体库-->
          <el-input v-model="LoginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码输入框区域 -->
        <el-form-item prop="password">
          <el-input v-model="LoginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'login',
  data () {
    return {
      LoginForm: {
        username: 'admin',
        password: '123456'
      },
      LoginFormRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击按钮重置输入框
    resetLoginForm () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.LoginForm)
        // console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 1.将登录成功之后的 token,保存到客户端的 sessionStorage中
        // 1.1项目中除了登录之外的其他API接口，必须在登录之后オ能询问
        // 1.2 token只应在当前网站打开期可生效，所以将 token保存在 sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }

}
</script>

<style lang="less" scoped>
.login_container{
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  // 使box在页面中进行居中
  position: absolute;
  left:50%;
  top:50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    width: 130px;
    height: 130px;
    border:1px solid #eee;
    border-radius: 50%;
    position: absolute;
    left:50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    box-shadow: 0 0 10px #ddd;
    padding: 10px;

    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
